Add devcontainer to repository

Fix update_coverage.py with lcov2.1 output

update_coverage.py

@@ -11,16 +11,21 @@ readme_file = "README.md"
 print("Updating coverage...")
 # Generate badge line
 output = subprocess.check_output(
-    "lcov --summary " + sys.argv[1] + "/coverage.info|cut -d' ' -f4 |head -2|"
-    "tail -1",
+    "lcov --summary " + sys.argv[1] + "/coverage.info",
     shell=True,
 )
-value = float(output.decode("utf-8").strip().replace("%", ""))
-if value < 90:
+value = output.decode("utf-8").strip()
+percentage = 0
+for line in value.splitlines():
+    if "lines" in line:
+        percentage = float(line.split(":")[1].split("%")[0])
+        break
+print(f"Coverage: {percentage}%")
+if percentage < 90:
     print("⛔Coverage is less than 90%. I won't update the badge.")
     sys.exit(1)
-percentage = output.decode("utf-8").strip().replace(".", ",")
-coverage_line = f"[![Coverage Badge](https://img.shields.io/badge/Coverage-{percentage}25-green)](html/index.html)"
+percentage_label = str(percentage).replace('.', ',')
+coverage_line = f"[![Coverage Badge](https://img.shields.io/badge/Coverage-{percentage_label}%25-green)](html/index.html)"
 # Update README.md
 with open(readme_file, "r") as f:
     lines = f.readlines()